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Abstract

Relativistically-intense laser beam with large field gradient (“laser gate”) enables strong inelastic scattering of electrons crossing the beam. This process allows for multi-MeV electron net acceleration per pass within the wavelength space. Inelastic scattering even in low-gradient laser field may also induce extremely tight temporal focusing and electron bunch formation down to quantum, zepto-second limit.

We neglect here the “radiation friction” force on electron; this was supported by all our estimates and numerical simulations for the specific situation. The time for an electron to pass through the laser gate is very short, and for the radiation friction to affect the motion, one needs γ ~ 102 -103, which is beyond the domain of interest. Also, when addressing the EM-electron interaction, we use classical approach, since in the cases of interest, a typical number of photons absorbed by an electron per pass, is of the order of mc2/h̄ω ~ 106.

Sov. Phys. JETP (1)

Other (6)

We neglect here the “radiation friction” force on electron; this was supported by all our estimates and numerical simulations for the specific situation. The time for an electron to pass through the laser gate is very short, and for the radiation friction to affect the motion, one needs γ ~ 102 -103, which is beyond the domain of interest. Also, when addressing the EM-electron interaction, we use classical approach, since in the cases of interest, a typical number of photons absorbed by an electron per pass, is of the order of mc2/h̄ω ~ 106.

Figures (3)

(a) Focal-plane L-beam field profiles fult(ξ) (solid) and ftrc(ξ) (dashed). (b) Distribution of transmitted electrons (N) with the incident momentum ρ0 = 3 over relativistic factor γ at the exit of the gate with the maximum field amplitude fmx = 12 for the field profiles fult (solid) and fcs with ξL = 2 (dashed). N0 - the total number of incident electrons.